CRM vs ERP vs SaaS: Which One Does Your Business Actually Need
I see it constantly: businesses buying expensive ERP when CRM is enough — or the reverse. Here's the difference in plain English plus a checklist for picking the right tool for your stage.
Over the last 6 years I've designed 5 CRMs from scratch and integrated SaaS stacks for 8 more projects. So I'll say it plainly: 80% of businesses don't need an ERP. They need a well-configured CRM + 3–4 SaaS tools. Let's figure out where you are.
CRM — for customers
CRM (Customer Relationship Management) handles what happens BEFORE and AFTER a sale: leads, deals, contacts, support. If your business is sales-driven (agency, B2B SaaS, education) — CRM is your core.
ERP — for resources
ERP (Enterprise Resource Planning) handles internal processes: warehouse, production, finance, HR, procurement. If you're e-commerce with a physical warehouse, manufacturing, or 50+ people — life without ERP gets painful.
SaaS — for specific jobs
SaaS = ready-made tools for one function: Calendly for calls, Notion for docs, Slack for chat, Stripe for payments. Composing 5–10 SaaS = a “no-code” backend for a small team.
How to know what you need
Under 10 people
Almost always — CRM (HubSpot Free / Pipedrive) + SaaS stack. ERP is overkill; you don't yet have the processes worth automating.
10–50 people
CRM is mandatory (custom now — HubSpot Pro or in-house). Maybe a light ERP (Odoo, NetSuite Starter) if you have warehouse or production.
50+ people
Without ERP it hurts. Separate CRM, separate ERP, integrated by API. Or enterprise like Salesforce + SAP. Expensive, but necessary.
Buy vs build
Buy off-the-shelf if your process is the standard one (sales, warehouse, HR). Build in-house if the process is unique and is your competitive advantage. For design agencies I always recommend building a custom CRM past 15 people: stock tools don't cover the production pipeline.
What it costs
HubSpot CRM: $0–1500/month. Custom CRM (UI + code): $15–50k one-time, $200–500/month hosting. Enterprise ERP: $50k+/year. SaaS stack of 8 tools: $300–1000/month.
How I decide on projects
I ask one question: “Which process is unique to you and earns you the money?” If the answer is sales, production, or onboarding — we build custom on exactly that process. The rest = ready SaaS.
If you want my read
Describe the business in two sentences, the team size, current stack. Within a day I'll send back a recommendation: buy, build, or hybrid. No sales pitch.
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